.myDiv {
              position: relative;
              z-index: 1;
}
          .myDiv .bg {
            position: absolute;
              z-index: -1;
              top: 0;
              bottom: 0;
              left: 0;
              right: 0;
              opacity: .2;
width: 100%;
              height: 100%;
          }
          .block-title {
            font-size: large;
            color: red;
}
